diff --git a/README.markdown b/README.markdown
--- a/README.markdown
+++ b/README.markdown
@@ -3,6 +3,8 @@
 [![CI](https://github.com/tfausak/splint/actions/workflows/ci.yml/badge.svg)](https://github.com/tfausak/splint/actions/workflows/ci.yml)
 [![Hackage](https://badgen.net/hackage/v/splint)](https://hackage.haskell.org/package/splint)
 
+:warning: This package is not maintained anymore.
+
 Splint makes [HLint 3][] available as a [GHC source plugin][]. It is similar to
 [hlint-source-plugin][] by Ollie Charles, except that it doesn't have to
 re-parse the module in order to lint it.
diff --git a/source/library/Splint.hs b/source/library/Splint.hs
--- a/source/library/Splint.hs
+++ b/source/library/Splint.hs
@@ -1,7 +1,5 @@
 module Splint where
 
-import qualified Control.Concurrent as Concurrent
-import qualified Control.Monad as Monad
 import qualified Data.Maybe as Maybe
 import qualified GHC.Data.Bag
 import qualified GHC.Driver.Config.Diagnostic
@@ -33,7 +31,7 @@
   dynFlags <- GHC.Plugins.getDynFlags
   let ghcMessageOpts = GHC.Driver.Config.Diagnostic.initPrintConfig dynFlags
       diagOpts = GHC.Driver.Config.Diagnostic.initDiagOpts dynFlags
-  Monad.void . GHC.Plugins.liftIO . Concurrent.forkIO $ do
+  GHC.Plugins.liftIO $ do
     settings <- Settings.load commandLineOptions
     GHC.Driver.Errors.printOrThrowDiagnostics logger ghcMessageOpts diagOpts
       . GHC.Types.Error.mkMessages
diff --git a/splint.cabal b/splint.cabal
--- a/splint.cabal
+++ b/splint.cabal
@@ -1,8 +1,10 @@
 cabal-version: 2.2
 name: splint
-version: 2.0.0.4
+version: 2.0.0.5
 synopsis: HLint as a GHC source plugin.
 description:
+  Warning: This package is not maintained anymore.
+  .
   Splint makes HLint available as a GHC source plugin. To use it, pass
   @-fplugin=Splint@ to GHC. Any options passed to Splint are passed through to
   HLint. For example you can use @-fplugin-opt=Splint:'--ignore=Use concatMap'@